Variables that are kept the same in all the groups during an experiment are

Constant variables are variables that are kept the same in all groups during an experiment.

Constant variables are kept the same in all groups during the experiment. Constant means straight through or kept the same. If shown on a chart, a line is described as constant, that would mean it doesn’t change. It keeps the same all the way through.

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The diaphragm is what i think ur talking about